Technical Advisors

J. Garfield MacVeigh, B.Sc.

J. Garfield MacVeigh, B.Sc.

President, CEO & Director Constantine Metal Resources

Garfield MacVeigh received his B.Sc. (Hons) First Class in geology from Queen’s University at Kingston in 1972 and has 45 years’ experience in gold and base metal exploration in Canada, U.S.A. and Central America. He participated in the discovery of the Hoyle Pond gold mine by Texasgulf in Timmins, Ontario (now operated by Goldcorp) and contributed to the exploration and discovery of the HW deposit and several new zones at Westmin Resources’ Buttle Lake massive sulphide mine on Vancouver Island, British Columbia (now owned by Nyrstar).

Mr. MacVeigh was a founding member, past President & CEO and Chairman of the Board of Rubicon Minerals Corporation from 1996 to 2006. Prior to 1995, Mr. MacVeigh spent 12 years with Texas Gulf and Falconbridge (now Glencore), 7 years with Westmin Resources and 5 years with Lac Minerals (now Barrick). Mr. MacVeigh has been President and CEO of Constantine Metal Resources Ltd. since its formation in 2006.


John Proffett, B.A., Ph.D.

John Proffett, B.A., Ph.D.

Geological Consultant

John Proffett received a B.A. (1964) and Ph.D. (1972) in geology from University of California, Berkeley. He worked 14 years for The Anaconda Co., first in the Yerington district, Nevada, where he was instrumental in discovery of the Ann-Mason Pass porphyry copper deposit, then in the vein mines at Butte, Montana. This was followed by exploration in Alaska, which resulted in discovery of volcanogenic massive sulfide deposits. The Anaconda work also included shorter assignments on various types of deposits in South America, Japan, Mexico, Africa, Canada and western United States. Since 1981 he has been a consulting geologist, based in Alaska, working on a variety of ore deposits and districts world-wide. This has included precious metal deposits in the western US, porphyry and related copper-gold-molybdenum deposits in Chile, Peru, Argentina, Indonesia, Namibia, Mongolia, Alaska and Canada, Mt. Isa type copper and lead-zinc-silver deposits in Australia, and massive sulfide and high-grade gold deposits in Alaska. The work has included exploration, evaluation, mine development, mining, geological staff training and problems of ore genesis, and has resulted in numerous consulting reports, published papers and a number of exploration successes.

In 2003 he received the Society of Economic Geologists (SEG) Silver Medal, and the SEG Brian Skinner Best Paper Award for a paper in the journal Economic Geology. In 2015 he received the first Geological Mapping Award of the Geological Society of America and was the SEG Distinguished Lecturer for 2019.


Jack DiMarchi, B.Sc.

Jack DiMarchi, B.Sc.

Principal, Core Geoscience

Mr. DiMarchi is a Certified Professional Geologist, registered in Alaska, with more than 40 years of experience that combines mineral exploration, mine operations and mine permitting into a unique skill set that he uses to help his mining clients develop their projects while reducing project risk, maximizing value, meeting their environmental obligations, and being a contributing member of the community where they operate.

Mr. DiMarchi initially spent almost 20 years exploring Alaska, Canada, South America, Mexico and the lower 48 states for gold and base metal deposits, eventually taking on roles as VP Exploration, and CEO of a junior mining companies.  In 1997, Mr. DiMarchi joined Teck Corporation, Canada’s largest diversified mining company, and spent the next decade managing the underground exploration and development of the Pogo Mine in Alaska. Participating in mine construction and startup, he became the mine’s first Chief Geologist, and helped bring the mine to full commercial production.  He left Teck in 2007 and formed Core Geoscience, which has consulted on many exploration and mining projects for junior and major mining companies, with a focus in Alaska and western Canada. 

During his career, Mr. DiMarchi also spent five years with the Alaska Department of Natural Resources Office of Project Management and Permitting as Large Mine Project Manager where he facilitated the permitting process for each of Alaska’s large mines. This included coordinating State and Federal permitting processes and community outreach - often in Alaska’s remote villages. In this capacity, he also acted as the lead for the State of Alaska as a cooperating agency in the National Environmental Policy Act (NEPA), Environmental Impact Statements (EIS) process for the large mines. Mr. DiMarchi has experience working collaboratively with the State agencies, US Forest Service, and the US Environmental Protection Agency (EPA). 

Finally, Mr. DiMarchi has worked with some of the larger resource consulting firms including Tetra Tech and Stantec where he managed many projects for satisfied mining and mineral exploration clients.



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